14 MOPSEADJE. 



edge of the branches. Axis articulated, calcareous, solid, expanded 

 at the base ; articulations contracted, short, cork-like or cartilaginous. 

 Branches from the contracted horny articulations. 



• Coral dichotomotis ; iwlype-cells on the edge of the branches. 

 36. ISIDELLA. 

 Coral branched, furcate. Axis smooth, cylindrical ; stony joints 

 elongate ; branches furcate, proceeding from the corneous '}o\\\is. Bark 

 rather thick, with irregular opaque spicula. Polypiferous cells pro- 

 duced, subcylindrieal. Base of axis expanded, lobed, and branched. 



Isidella, Gray, P. Z. S. 1857, p. 283. 



Isis (in part), Milne-Ediv. S)- Haime, Corall. i. p. 193. 



91. Isidella elongata. B.M. 



Branches very few and frequently anastomosed, round, elongate ; 

 joints elongate, deeply grooved ; internodes narrow. Bark unknown. 



Frutex niarinus &c., Seba, Thes. iii. t. lOG. f. 4. 



Isis elongata, Esiwr, i. t. G ; Laink. Mem. ed. 2, p. 475 ; Milne-Edw. 



Curall. i. p. 196. 

 Isidella elongata, Gray, P. Z. S. 1857, p. 283. 

 Mopsea elongata, Philijypi, Wief/tn. Arch. 1842, p. 38. 

 Mopsea mediterranea, Pisso, Eur. Merid. p. 322, f. 1. 



Hah, Mediterranean; Naples. 



Polypes long, exsert, and not retractile, forming a slender wart ; 

 closed polypes mostly reversed {fide Risso's fig.). 



The branches of/, elongata are said to be often anastomosed, and 

 for this reason it appears to be separated from /. gracilis ; but I have 

 never seen them in that state (Lamx. Pol. Flex. p. 477). 



92. Isidella gracilis. 



Base expanded, laminated ; stem and branches cylindrical ; 

 branches few ; joint of axis rather thick ; of upper part elongate, 

 translucent, smooth, white ; articulation swoUen. 



Isis gi-acilis, Lai7ix. Polyp. Flex. p. 477, 1. 18. f. 1, Eno. Meth. p. 466 ; 

 Kblliker, Ic. Hist. p. 140, 1. 15. f. 3 ; Milne-Edw. in Lamh. Hist. A. 

 s. V. ed. 2, ii. p. 476. 

 Mopsea gracilis, Da^ia, Exp. p. 679 ; Milne-Edw. Sf Haime, Corall, i. 

 p. 198. 

 Hah, West Indies. 



Milne-Edwards places this as a Mopsea, and Isis elongata as an 

 Isis, though it is figured by Esper as with the branches arising from 

 the cartilaginous joints. 



93. IsideUa coraUoides. 



Branches forked, reddish, very slender ; branehlets remote, rather 

 short. Bark with scattered ascending papillae. The calcareous joints 



